Hi All, I have a website www.allgermanparts.co.uk which uses a custom built extension to get car make, and model, and product data. It's having some issues whereby I select a make, then model, then sub model and press proceed and this should then show the product categories. However it often takes me back to 'select your vehicle. Go to choose a vehicle when it works but then try to change the vehicle and the previous model is still showing..The developer of the extension who also built the basic site and I do mean basic, says I can't see a reason but I think cache error. Suggests I upgrade to the latest version of the extension at only £500.00 so I did thinking this should cure it, only to find it hasn't.. Any thoughts please?